Power Steering Pump: Service and Repair
VANE PUMP ASSY
OVERHAUL
NOTICE:
^ Do not overtighten when using a vise.
^ When installing, coat the parts indicated by arrows with power steering fluid.
1. REMOVE FRONT WHEEL RH
2. DRAIN POWER STEERING FLUID
3. DISCONNECT OIL RESERVOIR TO PUMP HOSE NO.1
a. Remove the clip and disconnect the oil reservoir to pump hose No.1.
NOTICE: Take care not to spill fluid on the V belt.
4. REMOVE POWER STEERING OIL PRESSURE SWITCH
a. Disconnect the connector.
b. Remove the oil pressure switch from the union bolt.
NOTICE: If the oil pressure switch is dropped or damaged, replace it with a new one.
5. DISCONNECT PRESSURE FEED TUBE ASSY
a. Using a wrench (24 mm) to keep the pressure port union, remove the union bolt and the gasket.
b. Disconnect the pressure feed tube assy.
6. REMOVE VANE PUMP V BELT
a. Loosen the 2 bolts and remove the vane pump V belt.
7. REMOVE VANE PUMP ASSY
a. Remove the 2 bolts and the vane pump assy.
8. REMOVE POWER STEERING SUCTION PORT UNION
a. Remove the bolt and the suction port union.
b. Remove the O-ring from the suction port union.
9. REMOVE FLOW CONTROL VALVE
a. Remove the pressure port union.
b. Remove the O-ring from the pressure port union.
c. Remove the flow control valve and the compression spring.
10. REMOVE VANE PUMP BRACKET REAR
a. Remove the 2 bolts, nuts, and the bracket rear from the vane pump assy.
11. REMOVE VANE PUMP HOUSING REAR
a. Remove the 4 bolts and the housing rear from the housing front.
b. Remove the gasket.
c. Remove the 2 O-rings from the housing rear.
12. REMOVE VANE PUMP SIDE PLATE REAR
a. Remove the wave washer from the side plate rear.
b. Remove the side plate rear.
13. REMOVE VANE PUMP CAM RING
14. REMOVE VANE PUMP SHAFT SNAP RING
a. Using a screwdriver, remove the snap ring from the w/ pulley shaft sub-assy.
15. REMOVE VANE PUMP ROTOR
a. Remove the 10 vane pump plates from the vane pump rotor.
b. Remove the vane pump rotor.
16. REMOVE W/PULLEY SHAFT SUB-ASSY
17. REMOVE PUMP BRACKET FRONT
a. Remove the bolt and the bracket front from the housing front.
18. REMOVE VANE PUMP HOUSING OIL SEAL
a. Using a screwdriver, remove the housing oil seal from the housing front.
NOTICE: Be careful not to damage the bushing of the housing front.
19. INSPECT VANE PUMP SHAFT AND BUSH IN HOUSING FRONT
a. Using a micrometer and a caliper gauge, measure the oil clearance.
Maximum clearance: 0.07 mm (0.0028 inch)
If clearance exceeds maximum, replace the vane pump assy.
b. Check that there is no severe damage or wear on the bushing of the housing front and the w/ pulley shaft sub-assy.
If necessary, replace the vane pump assy.
20. INSPECT VANE PUMP ROTOR AND VANE PUMP PLATES
a. Using a micrometer, measure the thickness of the vane pump plates.
Standard thickness: 1.397 to 1.403 mm (0.0550 to 0.0552 inch)
b. Using a feeler gauge, measure the clearance between the vane pump rotor groove and the vane pump plate.
Maximum clearance: 0.03 mm (0.0012 inch)
If clearance exceeds maximum, replace the vane pump assy.
21. INSPECT FLOW CONTROL VALVE
a. Coat the flow control valve with power steering fluid and check that it falls smoothly into the flow control valve hole under its own weight.
If it lacks smoothness, replace the vane pump assy.
b. Check the flow control valve for leakage. Close one of the holes and apply compressed air, 392 to 490 kPa (4 to 5 kgf/cm2, 57 to 71 psi), into the opposite side hole, and confirm that air does not come out from the end holes.
If air leaks, replace the vane pump assy.
22. INSPECT FLOW CONTROL VALVE COMPRESSION SPRING
a. Using vernier calipers, measure the free length of the compression spring.
Minimum free length: 32.24 mm (1.2693 inch)
If less than minimum, replace the vane pump assy.
23. INSPECT PRESSURE PORT UNION
If the union seat in the pressure port union is severely damaged, it may cause fluid leakage. In that case, replace the vane pump assy.
24. INSTALL VANE PUMP HOUSING OIL SEAL
a. Coat a new housing oil seal lip with power steering fluid.
b. Using SST and a press, install the housing oil seal.
SST 09950-60010 (09951-00330), 09950-70010 (09951-07100)
NOTICE: Make sure that the housing oil seal is installed in the correct direction.
25. INSTALL PUMP BRACKET FRONT
a. Install the bracket front with the bolt.
Torque: 44 Nm (449 kgf-cm, 32 ft. lbs.)
26. INSTALL W/PULLEY SHAFT SUB-ASSY
a. Coat the bushing surface of the housing front with power steering fluid.
b. Gradually insert the w/ pulley shaft sub-assy.
NOTICE:
^ Do not damage the housing oil seal lip in the housing front.
^ After inserting the w/ pulley shaft sub-assy, check that the oil seal lip faces in the correct direction.
27. INSTALL VANE PUMP CAM RING
a. Align the holes of the vane pump cam ring with the 2 straight pins of the housing front, and install the vane pump cam ring with the inscribed mark facing upward.
28. INSTALL VANE PUMP ROTOR
a. Install the vane pump rotor with the inscribed mark facing downward.
NOTICE: Make sure that the vane pump rotor is installed in the correct direction.
b. Coat all 10 vane pump plates with power steering fluid.
c. Install the vane pump plates with the round end facing outward.
NOTICE: Make sure that the vane pump plates are installed in the correct direction.
29. INSTALL VANE PUMP SHAFT SNAP RING
a. Using a snap ring expander, install a new snap ring onto the w/ pulley shaft sub-assy.
30. INSTALL VANE PUMP SIDE PLATE REAR
a. Align the groove of the vane pump cam ring with that of the side plate rear to install.
b. Install the wave washer so that its protrusions fit into the slots in the side plate rear.
c. Coat 2 new O-rings with power steering fluid and install them onto the side plate rear.
31. INSTALL VANE PUMP HOUSING REAR
a. Install a new gasket to the housing front.
NOTICE: Make sure that the gasket is installed with the cutout in the correct position.
b. Install the housing rear with the 4 bolts.
Torque: 24 Nm (245 kgf-cm, 18 ft. lbs.)
32. MEASURE VANE PUMP ROTATION TORQUE
a. Check that the vane pump rotates smoothly without abnormal noise.
b. Temporarily install the service bolt.
Recommended service bolt:
Thread diameter: 10 mm (0.39 inch)
Thread pitch: 1.25 mm (0.0492 inch)
Bolt length: 50 mm (1.97 inch)
c. Using a torque wrench, check the vane pump rotating torque.
Rotating torque: 0.27 Nm (2.8 kgf-cm, 2.4 inch lbs.) or less
If rotating torque is not as specified, check the housing oil seal.
33. INSTALL VANE PUMP BRACKET REAR
a. Install the bracket rear with the 2 bolts and 2 nuts.
Torque: 44 Nm (449 kgf-cm, 32 ft. lbs.)
34. INSTALL FLOW CONTROL VALVE
a. Coat the compression spring with power steering fluid and install it to the housing front.
b. Coat the flow control valve with power steering fluid.
c. Install the flow control valve to the housing front.
NOTICE: Make sure that the flow control valve is installed in the correct direction.
d. Coat a new O-ring with power steering fluid and install it to the pressure port union.
e. Install the pressure port union to the housing front.
Torque: 83 Nm (846 kgf-cm, 61 ft. lbs.)
35. INSTALL POWER STEERING SUCTION PORT UNION
a. Coat a new O-ring with power steering fluid and install it to the suction port union.
b. Install the suction port union with the bolt to the housing front.
Torque: 13 Nm (133 kgf-cm, 10 ft. lbs.)
36. INSTALL VANE PUMP ASSY
a. Temporarily install the vane pump assy with the 2 bolts.
37. INSTALL VANE PUMP V BELT
a. Install the V belt and adjust the V belt tension.
b. Torque bolt A and bolt B
Torque: 43 Nm (440 kgf-cm, 32 ft. lbs.)
38. CONNECT PRESSURE FEED TUBE ASSY
a. Using a wrench (24 mm) to keep the pressure port union, connect the pressure feed tube assy with the union bolt and a new gasket.
Torque: 52 Nm (525 kgf-cm, 38 ft. lbs.)
NOTICE: Make sure that the stopper of the pressure feed tube assy touches the bracket front as shown in the illustration, then tighten the union bolt.
39. INSTALL POWER STEERING OIL PRESSURE SWITCH
a. Install the oil pressure switch to the union bolt.
Torque: 21 Nm (214 kgf-cm, 15 ft. lbs.)
NOTICE: Be careful to keep oil away from the connector.
b. Connect the connector.
40. CONNECT OIL RESERVOIR TO PUMP HOSE NO.1
a. Connect the oil reservoir to pump hose No.1.
b. Install the clip.
41. INSTALL FRONT WHEEL RH
Torque: 103 Nm (1,050 kgf-cm, 76 ft. lbs.)
42. BLEED POWER STEERING FLUID
43. CHECK FOR FLUID LEAKS